Have ScreenOrientationController use a timer for async event dispatch again

Source/modules/screen_orientation/ScreenOrientationController.h

Index: Source/modules/screen_orientation/ScreenOrientationController.h
diff --git a/Source/modules/screen_orientation/ScreenOrientationController.h b/Source/modules/screen_orientation/ScreenOrientationController.h
index 8680896c37e8f27ceb6c63d1ff825c2fe66b15e6..f77d1bc21695efb6b65f5f68bd546cfe8753a084 100644
--- a/Source/modules/screen_orientation/ScreenOrientationController.h
+++ b/Source/modules/screen_orientation/ScreenOrientationController.h
@@ -9,6 +9,7 @@
 #include "core/frame/PlatformEventController.h"
 #include "modules/ModulesExport.h"
 #include "platform/Supplementable.h"
+#include "platform/Timer.h"
 #include "public/platform/modules/screen_orientation/WebLockOrientationCallback.h"
 #include "public/platform/modules/screen_orientation/WebScreenOrientationLockType.h"
 #include "public/platform/modules/screen_orientation/WebScreenOrientationType.h"
@@ -60,13 +61,13 @@ private:
 
     void updateOrientation();
 
-    void dispatchChangeEvent();
+    void dispatchEventTimerFired(Timer<ScreenOrientationController>*);
 
     bool isActiveAndVisible() const;
 
     PersistentWillBeMember<ScreenOrientation> m_orientation;
     WebScreenOrientationClient* m_client;
-    bool m_isDispatchingEvent;
+    Timer<ScreenOrientationController> m_dispatchEventTimer;
 };
 
 } // namespace blink